2017-07-14 19:28:54 +00:00
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module.exports = grammar({
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name: 'bash',
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inline: $ => [
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$._statement,
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$._terminator,
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$._expression,
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$._primary_expression,
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$._variable_name,
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$._simple_variable_name,
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$._simple_word,
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],
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externals: $ => [
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$._simple_heredoc,
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$._heredoc_beginning,
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$._heredoc_middle,
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$._heredoc_end,
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$.file_descriptor,
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$.word,
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$._empty_value,
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$._concat,
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$.variable_name, // Variable name followed by an operator like '=' or '+='
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'\n',
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']',
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']]',
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'}',
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],
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extras: $ => [
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$.comment,
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token(choice(/\s/, '\\\n')),
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],
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rules: {
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program: $ => repeat($._terminated_statement),
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_terminated_statement: $ => seq(
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$._statement,
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$._terminator
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),
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// Statements
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_statement: $ => choice(
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$.variable_assignment,
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$.command,
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$.declaration_command,
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$.bracket_command,
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$.for_statement,
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$.while_statement,
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$.if_statement,
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$.case_statement,
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$.pipeline,
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$.list,
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$.subshell,
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$.function_definition
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),
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for_statement: $ => seq(
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'for',
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$._simple_variable_name,
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'in',
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repeat1($._expression),
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$._terminator,
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$.do_group
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),
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while_statement: $ => seq(
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'while',
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$._terminated_statement,
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$.do_group
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),
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do_group: $ => seq(
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'do',
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repeat($._terminated_statement),
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'done'
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),
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if_statement: $ => seq(
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'if',
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$._terminated_statement,
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'then',
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repeat($._terminated_statement),
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repeat($.elif_clause),
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optional($.else_clause),
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'fi'
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),
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elif_clause: $ => seq(
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'elif',
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$._terminated_statement,
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'then',
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repeat($._terminated_statement)
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),
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else_clause: $ => seq(
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'else',
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repeat($._terminated_statement)
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),
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case_statement: $ => seq(
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'case',
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$._expression,
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optional($._terminator),
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'in',
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$._terminator,
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repeat($.case_item),
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'esac'
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),
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case_item: $ => seq(
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$._expression,
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repeat(seq('|', $._expression)),
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')',
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repeat($._terminated_statement),
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';;'
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),
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function_definition: $ => seq(
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choice(
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seq('function', $._simple_variable_name, optional(seq('(', ')'))),
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seq($._simple_variable_name, '(', ')')
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),
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$.compound_statement,
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optional($.file_redirect)
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),
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compound_statement: $ => seq(
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'{',
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repeat($._terminated_statement),
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'}'
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),
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subshell: $ => seq(
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'(',
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repeat($._terminated_statement),
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$._statement,
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optional($._terminator),
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')'
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),
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pipeline: $ => prec.left(1, seq(
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$._statement,
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choice('|', '|&'),
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$._statement
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)),
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list: $ => prec.left(-1, seq(
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$._statement,
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choice('&&', '||'),
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$._statement
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)),
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bracket_command: $ => choice(
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seq('[', repeat1($._expression), ']'),
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seq('[[', repeat1($._expression), ']]')
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),
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// Commands
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command: $ => prec.left(seq(
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repeat(choice(
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$.variable_assignment,
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$.file_redirect
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)),
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$.command_name,
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repeat($._expression),
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repeat(choice(
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$.file_redirect,
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$.heredoc_redirect
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))
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)),
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command_name: $ => $._expression,
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variable_assignment: $ => seq(
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choice(
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$.variable_name,
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$.subscript
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),
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$._assignment
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),
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declaration_command: $ => seq(
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choice('declare', 'typeset', 'export', 'readonly', 'local'),
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repeat(choice(
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$.word,
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$._simple_variable_name,
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$.variable_assignment
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))
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),
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_assignment: $ => seq(
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choice(
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'=',
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'+='
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),
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choice(
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$._expression,
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$.array,
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$._empty_value
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)
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),
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subscript: $ => seq(
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$.variable_name,
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'[',
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$._expression,
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']'
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),
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file_redirect: $ => prec.left(seq(
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optional($.file_descriptor),
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choice('<', '>', '>>', '&>', '&>>', '<&', '>&'),
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$._expression
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)),
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heredoc_redirect: $ => seq(
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choice('<<', '<<-'),
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$.heredoc
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),
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heredoc: $ => choice(
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$._simple_heredoc,
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seq(
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$._heredoc_beginning,
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repeat(choice(
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$.expansion,
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$.simple_expansion,
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$._heredoc_middle
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)),
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$._heredoc_end
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)
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),
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// Expressions
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_expression: $ => choice(
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$.concatenation,
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$._primary_expression
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),
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_primary_expression: $ => choice(
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$.word,
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$._simple_word,
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$.string,
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$.raw_string,
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$.expansion,
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$.simple_expansion,
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$.command_substitution,
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$.process_substitution
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),
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concatenation: $ => prec(-1, seq(
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$._primary_expression,
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repeat1(seq($._concat, $._primary_expression))
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)),
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string: $ => seq(
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'"',
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repeat(choice(
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$._string_content,
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$.expansion,
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$.simple_expansion,
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$.command_substitution
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)),
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'"'
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),
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_string_content: $ => /[^"`$]+/,
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array: $ => seq(
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'(',
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repeat($._expression),
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')'
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),
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raw_string: $ => /'[^']*'/,
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simple_expansion: $ => seq(
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'$',
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$._variable_name
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),
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expansion: $ => seq(
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'${',
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choice(
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$._variable_name,
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seq('#', $._variable_name),
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seq('#', $._variable_name, '[', '@', ']'),
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seq($._variable_name, '[', '@', ']'),
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seq(
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$._variable_name,
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choice(':', ':?', '=', ':-', '%', '/'),
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optional(seq($._expression, optional($._concat)))
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)
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),
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'}'
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),
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_variable_name: $ => choice(
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$._simple_variable_name,
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$.special_variable_name
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),
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command_substitution: $ => choice(
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seq('$(', $._statement, ')'),
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prec(1, seq('`', $._statement, '`'))
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),
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2017-07-16 05:22:38 +00:00
|
|
|
process_substitution: $ => seq(
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2017-07-17 17:19:35 +00:00
|
|
|
choice('<(', '>('),
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2017-07-16 05:23:38 +00:00
|
|
|
$._statement,
|
2017-07-16 05:22:38 +00:00
|
|
|
')'
|
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|
),
|
|
|
|
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2017-07-17 17:19:35 +00:00
|
|
|
comment: $ => token(prec(-1, /#.*/)),
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2017-07-14 19:28:54 +00:00
|
|
|
|
2018-02-27 18:54:40 +00:00
|
|
|
_simple_variable_name: $ => alias($.identifier, $.variable_name),
|
|
|
|
|
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|
|
_simple_word: $ => alias($.identifier, $.word),
|
|
|
|
|
|
|
|
identifier: $ => /\w+/,
|
2017-07-14 21:34:49 +00:00
|
|
|
|
2017-07-16 05:13:55 +00:00
|
|
|
special_variable_name: $ => choice('*', '@', '#', '?', '-', '$', '!', '0', '_'),
|
2017-07-14 23:29:28 +00:00
|
|
|
|
2017-07-17 17:19:35 +00:00
|
|
|
_terminator: $ => choice(';', ';;', '\n', '&')
|
2017-07-14 19:28:54 +00:00
|
|
|
}
|
|
|
|
});
|